there are 204 of them in the mile high city; that's roughly three times the number of starbucks and mcdonald's combined. they come in all sizes and shapes. there is the health food store motif, and '70s-style head shops. there are storefronts pitching low-cost weed, and boutiques offering gourmet ganja. no stems and seeds here, just walnut-sized buds freshly harvested in the cultivation room out back. >> matt cook: when patients arrive, this is where they'll have to show their patient registry card and their driver's license to gain access to the actual marijuana center itself. >> kroft: you can smell it. this is all private enterprise, licensed, regulated and taxed by the state. it was enshrined in the colorado constitution after voters approved an amendment allowing the sale the marijuana to people who can demonstrate that they may benefit from its avowed medicinal properties. matt cook, a former narcotics officer, wrote the law and served as the state's first director of enforcement. >> cook: if you'll note, video security cameras in the system... in the ceiling. >> kroft: any reason for th